Special Seminar: Finding Order in Disorder—Atomic-scale understanding of phase transformations

ZOOM LINK
Meeting ID: 913 9744 0830
Passcode: 645291

Crystalline imperfections and their dynamics are essential in phase transformations and structure-property relationships in materials. Classical methods for determining atomic structures average over many unit cells. As a result, such methods cannot correctly capture atomic-level information on amorphous packing, point defects, chemical ordering, strain, and interfaces.

I will first present my recent work extending atomic electron tomography (AET) to overcome the limitations of conventional methods to obtain 3D atomic packing information with picometer precision in amorphous materials. With every atom accounted for, we can understand how atoms in amorphous solids arrange in short- to medium-range order and the implications of these findings for metallic glasses. I will then present other systems where chemical ordering and crystalline imperfections of point defects, strain, and interfaces play an essential role in phase transformations and atomic-scale structure-property relationships. Finally, I will discuss how feedback loops powered by experimental coordinates with picometer accuracy, scattering spectroscopy, and ab initio computational methods will guide materials discovery and design.

Hosted by Professor Laura Ray.

About the Speaker(s)

Dennis Kim
Research Scientist, UCLA

Dennis Kim is a research scientist at the University of California Los Angeles (UCLA) and holds a PhD in materials science from Caltech. Prior to his current position, he was a postdoctoral associate in the Department of Materials Science and Engineering at MIT, and a STROBE postdoctoral fellow in the Department of Physics and Astronomy at UCLA. His research background is in materials thermodynamics and understanding phase transformations through state-of-the-art scattering, imaging, and quantum mechanical computational techniques. He is interested in developing and optimizing materials for various applications in thermal, energy, and quantum sciences through a fundamental understanding from the atom up.

Contact

For more information, contact Ashley Parker at ashley.l.parker@dartmouth.edu.